| abstract |
The invention relates to a manufacturing method of a powder metallurgy composite screw tap. The method comprises the following steps: proportioning raw materials of a substrate, and step two: cutting layer raw material proportioning, and step three: pressing the substrate, and the fourth step: sintering the base body green body, and step five: pressing a cutting layer, and a sixth step: sintering the composite tap green body, and performing the seventh step: primary oil immersion, step eight: milling teeth, and the ninth step: external inspection, step ten: heat treatment, step eleven: blackening, step twelve: and (5) secondary oil immersion and packaging. The method is scientific and precise, the substrate and the cutting layer are processed separately, raw materials are saved, artificial chip guide grooves are avoided, the process is reduced, the cost is reduced, meanwhile, the cutting layer and the drill tip of the cutting work are made of high-hardness materials, the substrate is made of traditional materials, the reliable cutting of the stepped drill is guaranteed, and the stepped drill has high toughness and strength. |